Step 1.
- In a shaker, muddle fresh mint leaves with lime juice and simple syrup.
Step 2.
- Add rum and ice, then shake well to combine.
Step 3.
- Strain into a highball glass filled with crushed ice.
Step 4.
- Top with coconut water and gently stir.
Step 5.
- Garnish with a sprig of mint and a slice of coconut.